Microstructure and flow behaviour during backward extrusion of semi-solid 7075 aluminium alloy |
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| Authors: | Adriana Neag Véronique Favier Régis Bigot Mariana Pop |
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| Affiliation: | 1. State Key Lab of MMCs, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China;2. No. 52 Institute of China Ordnance Industries Group, 4 Hudemulin Road, Baotou 014034, Inner Mongolia, PR China;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China |
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| Abstract: | The microstructure and flow behaviour during thixo backward extrusion of 7075 aluminium alloy were investigated. Reheating the steel die and the aluminium billet placed into the die at the same time using an induction furnace provides rapidly a very homogeneous microstructure suitable for thixoforming. During thixoextrusion, despite the high solid fraction, the solid globules are weakly connected and slide over each other without any plastic deformation. The flow remains quasi homogeneous resulting in homogeneous induced microstructure of the component. |
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